Road scraper



May 10, 1932. E. A. WEEKS ROAD SGRAPER 3 Sheets-Sheet l File i Jan. 11, 1928 INVENTOR Ernest fZWee/rs ATTORNEYS E. A. WEEKS May 10, 1932.

ROAD 5 CRAPER Filed Jan. 11, 1928 5 Sheets-Sheet 2,

W iw w M Q a H fi Q W M A TTORNE Y May 10, 1932. E. A. WEEKS ROAD SCRAPER Filed Jan. 11, 1928 {5 Sheets-Sheet 3 lNl/f/VTOR Ernesi fl. Wee/1s Patented May 10, 1932 UNITED STATES PATENT OFFICE ERNEST A. WEEKS, OF KALAMAZOO, MICHIGAN, ASSIGNOR T ROOT SPRING SCRAPEB.

COMPANY, OF KALAMAZOO, MICHIGAN ROAD SCRAPER Application filed January 11, 1928. Serial No. 245,982.

-This invention relates to improvements in road scrapers.

The objects of the invention are v First, to'provide hydraulic control for a road scraper.

Second, to provide such a structure which is self-contained as an attachment for a truck. Third, to provide such a structure which will utilize hydraulic pressure means pro- .10 vided for controlling the dump.

Fourth, to provide an improved hydraulic control for the scraper in which the liquid,

oil, is forced into thecylinder and by its-pressure maintains the scraper fixedly in place.

Fifth, to provide improved means of relieving and adjusting the pressure on such a hydraulic control. v Sixth, to provide improved detailed construction for the attachment and support of 0 a hydraulic cylinder.-

3 following specification.

Seventh, to provide improved spring actuating connections to cooperate with such hydraulic control.

Further objects and objects pertaining to details and economies of my construction will definitely appear from the description-to follow.

I accomplish the objects of my invention by the devices and means described in the j The invention is clearly defined and pointed out in the claims. A device embodying my invention is clearly illustrated in the accompanying drawings forming a part of this specification, in which:

Fig. 1 is a detail side elevation view of a portion of the chassis or body of a truck with my improved scraper means in position, portions of the truck being broken away and other portions being-indicated by dotted lines. The same is there illustrated to take hydrau lic powerfrom the pump means provided for hydraulic dump. v

Fig. 2 is a detailed diagrammatic plan View reduced, of' the hydraulic connections and actuating means as they appear in Fig. 1, the

return springs and scraper supporting beam being omitted.

F-ig'. 3'is an enlarged detailed perspective m View of the hydraulic cylinder and its connections, parts being shown broken away.

4 is an enlarged detailed vertical longitudinal sectional view taken on section line H of Figs. 2, 3 and 9, through the center of thepower cylinder, portions being shown in full lines and the arrangement'of one of the return springs being indicated.

Fig. 5 is adetailed sectional elevation taken on line 5-5 of Figs. 1, 2 and 9 showing the relation of the spring supported scraper to the hydraulic cylinder scraper supporting beam and other parts. Fig. 6 is an enlarged detailed sectional view taken on line 6-6 of Fig. 1, a part ofvone turn of the spring being shown to indicate its operative relation.

Fig. 7 is'an enlarged detail vertical longi tudinal section on line 77 of Figs. 2 and 9 showing details of the pressure control.

Fig. 8 is an enlarged detailed vertical sectional elevation through the rotary pump and its valve taken on section line 88 of Figs. 1 and 2 showing the by-pass control to permit the spring return of the scraper.

Fig. 9 is a plan View of my invention as operated and controlled by a hand pump.

Fig. 10 is a detailed sectional elevation on line 10'10of Fig. 9 showing details of constructionand arrangement.

The parts will be identified by their numerals of reference which are the same in all views.

1 is the truck chassis frame. 2 is the cab. 3 is the scraper supporting beam carried by adjustable supports or brackets 4 4 bolted at 41 41 to chassis frame 1, and having curved segments 42 on which the scraper beam 3 is carried adjustably by the clamps 44, the construction being identical on both sides of the chassis. I

The scraper might be supported Without adjustment but the hydraulic control permits very ready adjustment and is of adof the hydraulic means. 8 is the hydraulic cylinder secured to the beam 3 preferably by a pair of U-shaped bolts 81. The head of the cylinder 82 is of heavy casting and notched to accommodate one of the flanges of the scraper supporting beam 3. The hydraulic cylinder is provided with the usual hydraulic piston 83 with a plunger rod 84 and with a return spring 85.

A cross head 86 is secured to the plunger rod 84 and is provided with projecting pivots Connecting links 52 connect the cross head to the actuating arms 51 of the rock shaft 5. Cross arm 9 with up-turned ends 91 provides connection for the. return springs 92 which are connected at the opposite end to brackets 93 on the scraper supporting beam 3. These springs may provide the entire power for returning the piston and elevating the scraper or the spring 85 may perform this function. Also to facilitate this action coiled springs 10 may be interposed between an abutment collar on bracket 31 and .an adjustable collar 101 on the shaft 5, the same being adjustably secured in place by setscrew 102, see Fig. 6.

There is considerable weight to the scraper structure and it seems best to provide a series of springs in the manner indicated to insure even and steady control, while it is equally clear that any one of the sets of springs re-. ferred to, if made sufiiciently strong, would do the work.

Where the truck to which my improved scraper is to be secured is provided with ahydraulic dump. I preferably use the hydraulic means there provided for actuating the hydrauliccylinder and cqntrollinqthe scraper. To accomplish thisI provide the connection 11 12 to the hydraulic pump 13.

1 The hydraulic pump 13 is driven from what is known as a take-off 14 on the transmission gear 15 of the truck. A 3-way valve 16 is provided for cutting off the h draulic con- ,trol of the dump 17 when the'hydraulic scraper control is utilized.

The pressure is then delivered from the pump 13'to the end of the hydraulic cvlinder past the specially constructed control check valve 18. There is a conical valve 19 seating in the seat 181 of the valve. This valve 19 is perforated longitudinally at 191. A plunger rod 20 with longitudinal grooves 201 adapted to adjust in the longitudinal bore 191 is provided for'relieving the heavy pressure when it is desired to regulate the pressure in thehydraulic cylinder. J

' Valve 19 is provided with a guiding stem 192 which extends into a guiding recess 183 in the screw cap 283 of the casing of valve 18.

The guiding stem 192 is longitudinally grooved to permit the free movement thereof in the recess. Th1s screw cap is of suflicien dimension to permit the introduction of the plunger 20.

A spring 205 connects this lever tothe casing'and returns the same Connection 206 is provided with a ring or handle 207 in the ca 2.

It will thus. be seen that no matter how strong the pressure, which may be two or three hundred pounds to the square inch, it will be perfectly easy for the operator to relieve that pressure and, if he wishes to completely raise his scraper, it isonly necessary for him to pull on the handle 207 which at once through connection 206 and yoke 203 raises plunger 20,-and relieves the pressure on the valve 19 through the grooves 201 in the said plunger rod 20 when the whole valve disk 19 can be easily raised and the return springs will force the hydraulic piston 83 inward and raise the scraper.

Of course to do this itis necessary to bypass the pump and this is done by controlling the by-pass valve 131 of the pump 13' .(see Fig. 8). This is done through the connection to the by-pass control lever 132 by the connection 133, the same comprising the necessary rods, links and levers as indicated.

The power take-off 14 is the same as that used for the dump and is controlled by the control lever 142 which is provided with connections 143 for that purpose, the sam'e being the usual connection for such take-01f and not necessary to detail here. i

.I provide a pressure gauge 21 which may be connected to the hydraulic cylinder or any other part subjected to the pressure, and enables the operator to regulate the control of the force that he will apply to the scraper and this can be regulated to anything within the capacity or load of the truck or frame to which the hydraulic scraper structure is attached.

\Vhere a truck with ahydraulic control on it is not available, I provide the structure as indicated in the Figs. 9 and 10.. I here When the valve is closed, of course, the pump,

oil can be pumped into the cylinder, whenthe valve is open it relieves the pressure in the hydraulic cylinder.

I have thus described my invention in its adaptations to the power plant and also to a hand operated pump. The hydraulic control as here shown is of great importance. The oil, when enclosed in the cylinder, is practically incompressible and holds the scraper fixedly in place. By this means worm gears, pinions and lock levers in common use are avoided and the waste of the great friction from the use of such devices is eliminated. The action of this hydraulic means is easy because of the use of oil which, of course, is a lubricant and its action in the cylinder is easy and quick with a minimum of friction. In the manipulation of a structure of this kind this advantage is of great importance.

I have described the structure as self-contained as an attachment to a truck. This is of very great advantage in such a structure but, of course, can be made use of in various ways.

I'desire to claim the invention specifically as shown and also broadly as pointed out in the appended claims.

Having thus described my invention, what I claim as new and desire to. secure by Letters Patent, is

1. In a scraper structure, the combination with a truck chassis having a power trans mission, a power take-off therefor with control extended to the cab of the truck, a pump with a valved by-pass to permit return of the oil with control extended to said cab, a scraper structure comprising a supporting beam adjustably attached to the said truck chassis, supporting brackets on said beam, a scraper, a rockshaft, spring arms from the said rockshaft to the said scraper, actuating arms on the rockshaft, a hydraulic power cylinder secured to said scraper supporting beam with connections to the power pump, a three-way cock for directing the oil to the said hydraulic cylinder, a crosshead for the said hydraulic cylinder, link connections therefrom to the actuating arms of the rockshaft, return spring means for said scraper, a control check valve with a regulating plunger rod therethrough, and connections therefrom to the cab to control the pressure in said cylinder.

2. In a scraper structure, the combination with a truck chassis, a power hydraulic trol said scraper and hold it a crosshead for the said hydraulic cylinder, link connections therefrom to the actuating arms of the rockshaft, and spring return means for the rockshaft, coacting as specified.

3. In a scraper structure, the combination with a truck chassis, a power hydraulic pump, a scraper structure comprising a supporting beam attached to said chassis, supporting brackets on said beam, a scraper, a rockshaft pivoted in said brackets, spring arms from the said rockshaft to the said scraper, actuating arms on the rockshaft, a hydraulic power cylinder secured to said beam with connections to the said power pump, a crosshead for the said hydraulic cylinder, link connections therefrom to the actuating arms of the rockshaft, coating as specified.

4. In a scraper structure, the combination with a truck chassis, a hydraulic pump, a

scraper structure comprising a supporting power cylinder secured to said beam with connections to the said pump, a crosshead for the said hydraulic cylinder, link connections therefrom to the actuating arms of the rockshaft to'hold them by the hydraulic pressure, coacting as specified,

5. In a scraper structure the combination of an adjustable supporting beam, a scraper, supporting brackets therefor, a rockshaft, spring arms from said rockshaft to said scraper, a hydraulic cylinder mounted on said supporting beam with suitable controls connected to said rockshaft to actuate the same and to apply pressure to said scraper and hold it by hydraulic pressure as specified.

6. In a scraper structure the combination of an adjustable supporting beam, 'a scraper, supporting brackets therefor, a rockshaft, arms from said rockshaft to said scraper, a hydraulic cylinder with suitable controls mounted on said supporting beam and connected to said rockshaft to actuate the same and to apply pressure to said scraper and hold it by hydraulic pressure as specified.

7. A scraper structure comprising the combination of an adjustable supporting beam,

a scraper with pivotal supports therefor, and a hydraulic cylinder mounted on said supporting beam connected to actuate and conby hydraulic pressure as specified.

8. In a scraper structure the combination of a scraper, a hydraulic cylinder for controlling same, spring returns for the said scraper, a check valve for. the "supply to said hydraulic cylinder, arelieffvalve disposed through the said checkvalve, a yoke and lever connection for said relief valve to actuate same to release pressure and raise check valve as specified.

9. In a scraper structure, the combination of an adjustable supporting beam, a scraper,

. nected to said rockshaft to actuate the same and to apply pressure to said scraper and.

hold it by hydraulic pressure, and a spring return means for said scraper.

10. A scraper structure comprising the combination of an adjustable supporting beam, 9. scraper with pivotal supports there for, and a hydraulic cylinder mounted on said supporting beam connected to actuate and control said scraper and hold it'by hydraulic pressure, and spring return means for said scraper.

11. In a scraper structure, the combination of a supporting beam, a scraper, suporting brackets therefor, a rockshaft, arms rom said rockshaft to saidscraper, a power cylinder mounted on; said supporting beam with suitable controls, a piston within said cylinder connected to said rockshaft to actuate the same and to apply pressure to said scraper and hold it to its work. I

12. A scraper structure comprising the combination of an adjustable beam, a scraper with pivotal supports therefor, a power cylinder mounted on said supporting beam, and a piston within said cylinder connected to actuate andcontrol said scraper and hold it to its work.

13. A scraper structure comprising the combination of an adjustable beam, a scraper with pivotal supports therefor, a power cylinder mounted on said supporting beam, a. piston within said cylinder connected to actuate and control said scraper and hold it to its work, and spring return means for said scraper.

14. In a scraper structure, the combination with a truck chassis, a pump carried thereby, a scraper structure comprising a supporting beam attached to and supported beneath said chassis, brackets on said beam, a rockshaft in said brackets, a scraper carried by said rockshaft, spring arms from said rockshaft to said scraper, actuating arms on said rockshaft, a power cylinder with piston between said beam and scraper, connections therefrom to actuate the arms of the rockshaft to apply pressure to said scraper and i hold it to its work, flexible connections from said power cylinder to said pump, and spring return means for said scraper.

15. In a scraper structure, the combination with a truck chassis, of a scraper structure comprising a supporting beam attached to v and supported beneath said chassis, brackets on said beam, a rockshaft in said brackets, a scraper carried by said rockshaft, spring arms from said rockshaft to said scraper, actuatlng arms on said rockshaft, a power cylinder with piston between said beam and scraper, connections therefrom to actuate the arms of the rockshaft to apply pressure to said scraper and hold it to its work, spring return means for said scraper, and means for delivering fluid under pressure to said cylinder.

16. In a scraper structure, the combination with a truck chassis, of a scraper structure comprising a supporting beam attached to and supported'beneath said chassis, brackets on said beam, a rockshaft in said brackets, a scraper carried by said rockshaft, actuating arms on said rockshaft, a power cylinder with piston between said beam and scraper, connections therefrom to actuate the arms of the rockshaft to apply pressure to said scraper and hold it to its work, spring return means for said scraper, and means for delivering fluid under pressure to said cylinder.

17. In a scraper structure, the combination with a truck' chassis, a scraper structure comprising a supporting beam attached to and supported beneath said chassis, brackets on said beam, a rockshaft in said brackets, a scraper carried by said rockshaft, actuating arms on said rockshaft, a power cylinder with piston between said beam and scraper, connections therefrom to actuate the arms of the rockshaft to apply pressure to said scraper and hold it to its work, and means for delivering fluid under pressure to said cylinder. 7

18. In a scraper structure, the combination with a truck chassis, of a scraper structure comprising a supporting beam attached to and supported beneath said chassis, brackets on said beam, a rockshaft in said brackets, a scraper carried by said rockshaft, actuating arms on said rockshaft, a power cylinder with piston between said beam and scraper, connections therefrom to actuate the arms of the rockshaft to apply pressure to said scrap- ,er and hold it to its work, means for delivering fluid under pressure to said cylinder, and spring means to elevate said scraper.

19. In a scraper structure, the combination with a truck chassis, of a scraper structure comprising a supporting beam attached to and supported beneath said chassis, brackets on said beam, a rockshaft in said brackets. a scraper carried by said rockshaft, actuat ing arms on said rockshaft, a power cylinder with piston between said beam and scraper, connections therefrom to actuate the arms of the rockshaft to apply pressure to said scraper and hold it to its work, and means for delivering fluid under pressure to said cylinder.

In witness whereof I have hereunto set my hand.

ERNEST .A. WEEKS. 

